620855 has 4 divisors (see below), whose sum is σ = 745032. Its totient is φ = 496680.

The previous prime is 620849. The next prime is 620869. The reversal of 620855 is 558026.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 620855 - 2¹⁰ = 619831 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9 and base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62081 + ... + 62090.

It is an arithmetic number, because the mean of its divisors is an integer number (186258).

2⁶²⁰⁸⁵⁵ is an apocalyptic number.

620855 is a deficient number, since it is larger than the sum of its proper divisors (124177).

620855 is a wasteful number, since it uses less digits than its factorization.

620855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124176.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 620855 is about 787.9435258951. The cubic root of 620855 is about 85.3093686095.

The spelling of 620855 in words is "six hundred twenty thousand, eight hundred fifty-five".